JPH11216196A - Radiation therapeutic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation therapeutic apparatus that can suppress radiational exposure of normal tissue by dispersing the radiation three dimensionally. SOLUTION: The radiation therapeutic apparatus consists of X-ray generator 134 that radiates X-ray, collimators 136 and 137 that control the area which is irradiated with X-ray from the generator 134 (that is toward directions of x and y of horizontal level) and therapeutic bed 133 for a patient who is cured by irradiation of which area is controlled by the collimators 136 and 137. The area controlled by the collimator 136 toward the direction of y can be moved within the area that is opened by the collimator 137 toward the direction of x. The therapeutic bed 133 can be moved interlocking with the collimator 136 moves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiotherapy apparatus capable of three-dimensionally and accurately irradiating radiation to an affected part without exposing a part other than the affected part as much as possible and treating the radiation in a short time.

[0002]

2. Description of the Related Art A conventional radiotherapy apparatus using a rotary irradiation method is configured, for example, as shown in FIG. In the figure, reference numeral 31 denotes an apparatus main body, 32 denotes a housing that houses the radiation generating apparatus, and the housing 32 is a horizontal member including a patient's diseased part I on a treatment table 33 horizontally supported by a support 33A. It is configured to be rotatable about an axis (in the figure, the y axis). Numeral 34 denotes an X-ray generator housed in a housing 32, 3
Reference numeral 5 denotes a first-stage collimator for limiting an irradiation area (hereinafter, referred to as an “irradiation field”) of the X-rays emitted from the X-ray generator 34, and reference numeral 36 denotes a pair of collimator leaves 36A for X-rays from the first-stage collimator 35. , 36B are moved in the y-direction to limit them (see FIG. 29), and 37 is an X-collimator that limits the X-rays restricted by the Y collimator 36 by further moving the pair of collimator leaves 37A, 37B in the x-direction. It is.

Next, the operation will be described. In the case of the radiotherapy apparatus shown in FIG. 28, the irradiation of the X-rays generated by the X-ray generator 34 is first restricted by the first-stage collimator 35 fixed in the housing 32, and then the Y-collimator 36 Is driven to change the opening, the collimator 36 restricts the irradiation field in the y direction symmetrically to the x axis,
Further, when the X collimator 37 is driven to change its opening degree, the collimator 37 reaches the diseased part I in a state where the irradiation field in the x direction is symmetrically limited to the y axis. And the housing 3
2 is rotated about the y-axis, thereby changing the X-ray irradiation direction by 360 ° to disperse the exposure dose to the normal tissue in the xz plane (shown by B in FIG. 30) as shown in FIG. To reduce it.

Another conventional radiotherapy apparatus using the rotary irradiation method is configured, for example, as shown in FIG. As shown in FIG. 28, the present radiation therapy apparatus uses a device main body 41 having a high-frequency electric field generation unit and a microwave input from the high-frequency electric field generation unit of the device main body 41, as shown in FIG. And a housing 42 configured to emit an X-ray or an electron beam by accelerating an electron beam. The housing 42 rotates around a treatment table 43 around the y-axis while the affected part I of the patient is It is configured to irradiate radiation. In the housing 42, an electron generating unit 44 for generating an electron beam, an electron accelerating unit 45 for accelerating the electron beam of the electron generating unit 44 to the speed of light using the microwave, and an electron accelerating unit 45 A deflection electromagnet 46 for deflecting the electron beam accelerated by the electron beam in a direction orthogonal to the treatment table 43, and a target 4 for generating X-rays when the electron beam deflected by the deflection electromagnet 46 is irradiated.
7 and a collimator 48 for limiting the X-ray emitted from the target 47 are provided. And
To perform the X-ray treatment, the affected area I of the patient on the treatment table 43 is irradiated with X-rays in a state where the irradiation field is restricted by the collimator 48, and the treatment is performed. Incidentally, 4
3A is a support table of the treatment table 43.

Next, the operation will be described. To treat a patient, first, the position of the affected area I in the patient and the affected area I
Is determined by a diagnostic device such as an X-ray CT, and thereafter, the electron beam to be irradiated, the type of X-ray, the energy, and the irradiation field are determined by the treatment planning device. In the case of performing the treatment, xz is applied while the housing 42 is rotated up to 270 ° in the left and right direction of the patient around the affected part I of the patient on the treatment table 43.
The affected part I is treated by irradiating the affected part I two-dimensionally in the plane. When three-dimensionally irradiating the diseased part I, the setting state of the patient is changed, the diseased part I is positioned again, and then two-dimensionally radiated.

[0006] Still another radiotherapy apparatus using a conventional rotary irradiation method is configured as shown in FIG. 32, for example. As shown in FIGS. 1A and 1B, the present radiation therapy apparatus has a fixed apparatus body 51 and a casing rotatably disposed in the apparatus body 51, similarly to the above-described respective radiation therapy apparatuses. 52, and a radiation source 54 of an irradiation head portion extending from the housing 52. The patient's affected part is rotated while rotating the housing 52 around the treatment table 53 as indicated by an arrow in FIG. It is configured to irradiate the (isocenter) I with the collimator 55 limiting the irradiation field of the radiation X. Reference numeral 56 denotes a rotating bearing.

Next, the operation will be described. When the affected part I is near the surface of the patient's body as shown in FIGS. 33 (a) and (b), the isocenter I is adjusted to it.
The radiation X from the radiation source 54 is applied to the affected part I of the patient on the treatment table 53 while limiting the irradiation field by the collimator 55. When the affected part I is near the center of the human body as shown in FIGS. 34 (a) and 34 (b), the isocenter I is moved in accordance with it and the affected part I is rotated while the housing 52 is rotated.
And treatment is performed with the radiation dose to normal tissues suppressed as much as possible.

When it is necessary to irradiate the radiation to the affected part I in a concentrated manner, the treatment table 53 is moved up and down and left and right as shown by arrows in FIG. Irradiation to normal tissue is suppressed, and when treatment is to be performed while avoiding the important organ I1, as shown in FIG. 37, the treatment table 53 is driven to position the diseased part I at the isocenter. .

FIG. 38 is a view showing a conventional medical linac. This apparatus is similar to each of the above-mentioned radiotherapy apparatuses.
The apparatus includes a device main body 71, a housing 72, a treatment table 73, a radiation source 74, and a collimator 75, and emits radiation X to the affected part I of the patient on the treatment table 73 while rotating about the y-axis to perform treatment. It is configured and operates in a manner similar to that described above.

FIG. 39 shows a three-dimensional irradiation machine for head treatment using cobalt 60 called a γ knife. Reference numeral 74A denotes a cobalt 60 source provided with about 200 units, and 75A denotes radiation from the cobalt 60 source. 38, I is a concentration point where the radiation is concentrated, and the same reference numerals as those in FIG. 38 denote the same or corresponding parts. The operation of the three-dimensional irradiation apparatus for head treatment will be described. Radiation from the cobalt 60 radiation source 74A is converged by the collimator 75A and focused on the affected part I of the patient. At this time,
Radiation is arranged around 200 three-dimensionally around the head, so the radiation is dispersed and incident on the surface of the head,
While the dose at each site is low, the diseased part I can be irradiated with the dose required for treatment. Reference numeral 79 denotes a fixture for fixing the head.

[0011]

However, in the case of the conventional radiotherapy apparatus shown in FIG. 28, the Y collimator 36 is arranged so that the collimator leaves 36A and 36B are symmetrical with respect to the x axis. Even if the housing 32 is rotated to disperse the absorbed dose of X-rays to the normal tissue, only the X-ray is dispersed in the xz plane as shown in FIG. There was a problem that it could not be dispersed, and that the exposure dose to normal tissues could not be ignored.

In the case of the conventional radiotherapy apparatus shown in FIG. 31, when the affected part I is irradiated with radiation such as X-rays or electron beams, the radiation irradiation direction is limited to two dimensions.
When performing three-dimensional irradiation, it is necessary to add a device for changing the state and irradiation direction of the patient each time. Further, whenever the affected part I is displaced from the irradiation position each time the affected part I of the patient is changed, There has been a problem that the tissue is exposed to a greater number of exposures, which imposes a burden on the patient.

Further, in the conventional radiation therapy apparatus shown in FIG. 32, when it is necessary to irradiate the radiation intensively to the diseased part I, even if the rotational irradiation is performed, the radiation irradiation to the normal tissue increases accordingly. The treatment table 53 is
In order to suppress irradiation of normal tissue as much as possible as shown in FIG. 36 by moving or rotating as shown by arrows in FIG. 36, the driving mechanism of the treatment table 53 is complicated. And the affected area I
However, there is a problem that it is difficult to perform highly accurate treatment due to deviation from the original irradiation position. Also, as shown in FIG. 37, when the treatment is to be performed while avoiding the important organ I1, there is a problem that the positioning of the treatment table 53 is very difficult.

Further, in the radiotherapy apparatus shown in FIG.
Radiation can be concentrated three-dimensionally on the diseased part I, but since about 200 cobalt 60 and collimator 75A are required, the manufacturing cost of the apparatus is high, and the half life of cobalt 60 is every five years. In addition, there is a problem that the radiation source 75A must be replaced, the management is complicated, and it is difficult to align the radiation with the diseased part I, and it takes time for the treatment.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a radiation therapy apparatus capable of dispersing the irradiation dose to normal tissues in three dimensions to suppress the exposure dose to normal tissues. It is an object.

Further, the present invention provides a radiotherapy apparatus capable of performing accurate treatment in a short time by accurately positioning radiation to an affected part by simply driving an irradiation part without driving a treatment table. It is intended to provide.

[0017]

According to a first aspect of the present invention, there is provided a radiotherapy apparatus comprising: a collimator for restricting an irradiation field of a plurality of collimators for restricting a y-direction of an irradiation field and an x-direction; And the treatment table can be moved in conjunction with the former collimator.

Further, in the radiotherapy apparatus according to the second aspect of the present invention, an arc-shaped path is formed in the rotating body in a direction crossing the rotation direction of the irradiation section, and the irradiation section reciprocates along the path. It is configured to be movable.

According to a third aspect of the present invention, in the radiation therapy apparatus, the rotating body has an arc shape and has an irradiation section at an end thereof, and the rotating body is connected to the apparatus body at the irradiation section. It is configured to be able to reciprocate in a direction crossing the rotation direction of the part.

Further, the radiotherapy apparatus according to the fourth aspect of the present invention is configured such that the main body of the apparatus can move in an arc shape centering on the isocenter.

In the radiation therapy apparatus according to a fifth aspect of the present invention, the rotating body is formed in an arc shape centered on the isocenter, and the radiation is irradiated on the rotating body so that the radiation is concentrated at the isocenter. A plurality of units are arranged in a distributed manner.

According to a sixth aspect of the present invention, there is provided a radiotherapy apparatus, comprising: a main body of the apparatus; a movable body movable in an arc shape with respect to the main body of the apparatus; and a bearing provided on the movable body via a bearing. A rotating body rotatable around the center, and an irradiation unit housed in the rotating body, the affected part is located on the center axis of the bearing with respect to the movement of the moving body, and the center axis, The line connecting the irradiated part and the affected part is always orthogonal to each other.

[0023]

According to the first aspect of the present invention, the irradiation field of the collimator for limiting the y direction moves in the y direction within the opening range of the collimator for limiting the x direction.
By moving the treatment table in conjunction with the collimator that restricts the y-direction, radiation can be irradiated from other than the xz plane, and the radiation dose to normal tissues can be dispersed.

According to the second aspect of the present invention, while the treatment table is fixed, the irradiation unit reciprocates along an arcuate path in a direction intersecting the rotation direction thereof,
At each position on the moved path, the irradiation unit emits radiation while rotating about the diseased part as a center, thereby three-dimensionally irradiating the diseased part.

According to the third aspect of the present invention, while the treatment table is fixed, the rotating body reciprocates in a direction intersecting with the rotation direction of the irradiation unit at the connection portion with the apparatus main body. Then, at each of the moved positions, the irradiation unit can irradiate the radiation while rotating about the diseased part as a center, thereby three-dimensionally irradiating the diseased part.

According to the fourth aspect of the present invention, the irradiation unit can be easily adjusted to the isocenter simply by moving the apparatus main body in an arc shape centered on the isocenter while the treatment table is fixed. The radiation can be concentrated on the affected area.

According to the fifth aspect of the present invention, when radiation is irradiated from the irradiation unit, the radiation concentrates on the affected area from a plurality of positions of the rotating body to the isocenter, and the rotating body is rotated in this state. The affected area can be intensively treated three-dimensionally.

According to the invention described in claim 6 of the present invention, when the moving body moves, the affected part is located on the center axis of the bearing, and the center axis is connected to the irradiation part and the affected part. Are always orthogonal to each other, and when the rotator is rotated around the affected part and the affected part is intensively treated three-dimensionally, the radiation irradiation does not concentrate on some normal parts.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. Embodiment 1 FIG. As shown in FIG. 1, the radiation therapy apparatus according to the present embodiment includes a fixed apparatus main body 131 and this apparatus main body 13.
A housing 1 as a rotating body rotatably arranged in 1
The housing 132 has an irradiation unit (X-ray generator) 134 for irradiating radiation, and the X-ray generator 13
The first collimator 135, the Y collimator 136, and the X collimator 137 that limit the radiation field (horizontal x direction and y direction) from the collimator 13 are provided.
It is configured to treat the affected part I of the patient on the treatment table 133 with radiation whose irradiation field is limited by 5, 136, and 137.

The plurality of collimators 135, 1
36, 137, the Y collimator 136 for limiting the y direction of the irradiation field, while making a narrow irradiation field centering on the irradiation source of the X-ray generator 134, the irradiation field is adjusted in the y direction of the opening degree of the first stage collimator 135. (The range from A to B in FIG. 2). on the other hand,
The treatment table 133 is configured to move so as to irradiate the affected part I with radiation at all positions in the swing range in conjunction with the swing operation of the Y collimator 136.

That is, the Y collimator 136 is shown in FIGS.
As shown in FIG. 7, a pair of arc-shaped collimator leaves 136 are formed.
A and 136B, each of which is configured such that the degree of opening can be adjusted to irradiate the affected part I with an optimal radiation dose.
Then, this Y collimator 136 is, for example,
When irradiating the affected part I by moving to the position shown in FIG. 2, the radiation from the first collimator 135 is almost blocked by one collimator leaf 136B, and only the affected part I is irradiated.
When irradiating the affected part I by moving to the position shown in FIG. 3, the radiation from the first collimator 135 is almost blocked by the other collimator leaf 136A as shown in FIG. And the Y collimator 136 is A
Can be set to move from the position B to the position B in a plurality of stages, and the treatment table 133 moves in conjunction with this and moves from the position shown in FIG. 2 to the position shown in FIG. At the set position, radiation is irradiated to the affected part I.

The housing 132 accommodating the X-ray generator 134 and the like, as shown in FIGS.
At each of the 36 movement positions, the object is rotated 360 ° about the y-axis, and is irradiated with radiation on the xz plane at each position, thereby enabling three-dimensional irradiation.

As described above, according to this embodiment, Y
The collimator 136 is sequentially moved around the diseased part I, and the angle of incidence of the radiation on the diseased part I changes as shown by the hatched area in FIG. The treatment can be performed, and in the normal tissue other than the affected part, the radiation is dispersed in a spherical shape, and the exposure dose to the normal tissue can be reduced.

Further, the above-mentioned radiotherapy apparatus includes a radiotherapy planning apparatus shown in FIG. This radiation treatment planning apparatus calculates the optimum value of the leaf data (opening degree data) of the Y collimator 136 and the position data of the treatment table 133, and the computer is operated based on the calculation result, and the X collimator leaf control device, Y collimator leaf control device,
The X and Y collimator leaves, the gantry and the treatment table are driven and controlled via the gantry rotation control device, the treatment table and the long direction control device.

The Y collimator 136 is similar to the one shown in FIG.
As shown in FIG. 3, a description has been given of a case where the entire range of the opening degree of the first-stage collimator 135 can be shielded. However, one collimator leaf 136 </ b> B of the Y collimator 136 is driven so as to cover the entire range of the first-stage collimator 135 (see FIG. 3). 6), and the other collimator leaf 136A may be configured to be driven so as to block the half-opening of the first-stage collimator 135 as shown in FIG.

As described above, according to the present embodiment, the collimator leaves 136A and 136B are adjusted to the degree of opening suitable for the affected part I as in the above embodiment, and the casing 13 is rotated about the y-axis.
2 and further rotate each collimator leaf 136A, 1
36B is sequentially moved as it is, and the treatment table 133 is linked to each irradiation position to irradiate the affected part I with radiation. As shown in FIG. Therefore, the same operation and effect as in the above-described case can be obtained.

Embodiment 2 FIG. The radiation therapy apparatus according to the present embodiment includes:
As shown in FIG. 9, a fixed apparatus main body 141 and a casing 14 rotatably arranged in the apparatus main body 141 are provided.
2 and the irradiation head 144 connected to the housing 142
Is configured to irradiate radiation to the affected part I of the patient while rotating around the treatment table 143 about the y-axis. Also,
The irradiation head unit 144 is connected to a driving unit 145 extending horizontally from the housing 142 along the treatment table 143,
It is possible to move around the affected part I of the patient on the treatment table 143 along the arcuate path 145A formed in the driving part 145. That is, a motor (not shown) is provided in the irradiation head section 144, and a gear 14 of this motor is provided.
The irradiation head section 144 reciprocates along the path 145A via the line 6. Therefore, the irradiation head unit 144
The patient moves along the arcuate path 145A around the diseased part I in the direction perpendicular to the rotation plane in the xy plane formed by rotating together with the housing 142 to irradiate the diseased part I with radiation. I is irradiated three-dimensionally. Also,
The drive unit 145 is configured as a drive system independent of the housing 142. 143A is a support table for the treatment table 143.

Next, the operation will be described. First, FIG.
In a state where the irradiation head unit 144 is located at C of 0, radiation from the irradiation head unit 144 is irradiated to the treatment table 143 in the vertical direction to treat the affected part I, and subsequently, the casing 142
Is rotated, the irradiation head unit 144 rotates in the xz plane, and the irradiation head unit 144 irradiates radiation from the circumference in the xz plane in which the irradiation head unit 144 moves to perform treatment by two-dimensional irradiation. Next, after driving the gear 146 to D ′ to position the irradiation head unit 144 at D in FIG. 10 and irradiating radiation from the irradiation head unit 144 in the same manner, the circumference drawn at the position C is The intersecting circumference can be described and the surroundings can be treated at different parts of the affected area I. Furthermore,
By driving the gear 146 to E ′, the irradiation head 144
Is positioned at E in FIG. 10 and then similarly irradiated with radiation from the irradiation head section 144, a circle intersecting the circumference drawn at each of the positions C and D is drawn, and the affected area I is further drawn.
The surrounding area can be treated from different directions.

As described above, according to this embodiment, the gear 146 is driven to move the irradiation head 144 to the path 14.
By setting sequentially at different positions of 5A, the affected area I
Thus, a spherical, ie, three-dimensional, irradiation treatment is performed, and the irradiation dose to the normal tissue can be dispersed to suppress the exposure dose to the normal tissue. Note that the drive unit 145 and the jig can be changed in form as necessary for the treatment, and the irradiation range can be appropriately changed.

Embodiment 3 FIG. The radiation therapy apparatus according to the present embodiment includes:
As shown in FIG. 11, the apparatus includes a fixed apparatus main body 151 and an arc-shaped arm 152 that is rotatably disposed with respect to the apparatus main body 151 and that is centered on the isocenter I. An arm 152 includes a radiation generator 154 for irradiating radiation, and a collimator 155 for limiting a radiation irradiation field from the radiation generator 154.
The table 15 is rotated while rotating the
3 to irradiate the affected area I of the patient. A rail 157 is provided on the arm 152 along the side surface thereof, and the motor 1 is connected via the rail 157.
The driving force of 58 is transmitted to the arm 152 to move the arm 152 from one end to the other end as shown by the arrow in FIG. Further, the other end of the arm 152 is opposed to the irradiation head unit 156 so as to face the radiation detector 15.
9 is disposed, and the radiation
It is possible to detect the distribution state of the radiation in real time. 153A is a treatment table 153.
It is a support stand.

The arm 152 is provided, for example, in FIG.
As shown in (a), three acceleration tubes 152A, a drift space 152B located between each of the acceleration tubes 152A,
A magnet 152C disposed in each drift space 152B and deflecting an electron beam in each drift space 152B. These members are arranged in an arc shape, and the electron beam is stably transmitted to the irradiation head unit 154 by the magnet 152C. Is to be guided to. still,
152D is an electron gun. In the case of the arm 152, even a long accelerating tube necessary for obtaining a high energy beam can be manufactured.

Conventionally, in order to mount the accelerating tube 152A on the arc-shaped arm 152, it was necessary to shorten the length of the accelerating tube as shown in FIG. 12 (b). However, by providing the drift space 152B therebetween, the arm 152 of this embodiment can be manufactured.

Therefore, when irradiating the affected part I with a large dose of radiation, the driving force of the motor 158 is transmitted to the arm 152 via the rail 157 in order to minimize the dose applied to the normal tissue. Around the arm 15
2 by changing the position of the moved radiation generating unit 154, the radiation _X 1 from the position as shown in FIG. 13 _{(a), X} 2,
Irradiated with X ₃ arm 1, also as an axis of rotation for the bearing 154 as shown in FIG. 13 (b) at each position
By rotating the 52 around the diseased part I and irradiating the radiation, the diseased part I can be three-dimensionally irradiated as a whole without moving the treatment table 153, and accurate treatment can be easily performed.

As described above, according to this embodiment, the radiation can be accurately positioned on the affected area I only by rotating and driving the radiation generator 154, that is, the arm 152, without complicatedly driving the treatment table 153. In addition, radiation can be concentrated on the affected area I and irradiated with a large dose while avoiding important organs and normal tissues, so that accurate treatment can be performed.

Embodiment 4 FIG. The radiation therapy apparatus according to the present embodiment includes:
As shown in FIG. 14, all the components are the same as in the third embodiment except that a radiation generator 154A and a collimator 155A similar to the radiation generator 154 having a radiation source are provided instead of the radiation detector in the third embodiment. It is configured.
Therefore, according to the present embodiment, the irradiation time of radiation can be reduced to half.

Embodiment 5 FIG. The radiation therapy apparatus according to the present embodiment includes:
As shown in FIG. 15, an arc-shaped rail 151B provided on a ceiling 151A, and a mounting portion 158A movably mounted on the rail 151B are provided.
The configuration is the same as that of the third embodiment except that the arm 152 is attached to 58A. The center of the rail 151B is located at the intersection with the vertical line from the isocenter I. Therefore, also in this embodiment, Embodiment 3
The same operation and effect as described above can be obtained.

Embodiment 6 FIG. The radiation therapy apparatus according to the present embodiment includes:
As shown in FIG. 16, an apparatus main body 161 and a housing 162 rotatably disposed with respect to the apparatus main body 161 are provided. The housing 162 has a radiation generator 164 for irradiating radiation, A collimator (not shown) for limiting a radiation irradiation field from the radiation generator 164, while irradiating radiation to the affected part I of the patient on the treatment table 163 while rotating the housing 162 with the rotating bearing 166; ,
The apparatus main body 161 moves in an arc shape in the direction of the arrow in FIG. In this embodiment, as shown in FIG. 17, the isocenter I is moved so that the apparatus main body 161 moves.
Rail 1 as a path formed in an arc with the center at the center
67 is provided, and the apparatus main body 161 runs along the rail 167.

Therefore, when irradiating the affected part I with a large dose of radiation, the apparatus main body 161 is moved around the affected part I in order to minimize the dose applied to the normal tissue.
18, the irradiation position from the radiation source 164 is changed as shown in FIG. 18, radiation X is irradiated from each position, and the rotating bearing 16
By rotating the housing 162 about the diseased part I around the axis 6 and irradiating the radiation intensively, the diseased part I can be three-dimensionally irradiated as a whole without moving the treatment table 163 to easily perform accurate treatment. Can do it.

As described above, according to the present embodiment, the radiation source 164 of the irradiation head unit, that is, the casing 162 is simply driven to rotate without causing the treatment table 163 to be driven in a complicated manner. I, and the radiation can be concentrated on the affected area I and irradiated with a large dose while avoiding important organs and normal tissues, thereby performing accurate treatment.

Further, as shown in FIG.
61 is provided on a fan-shaped drive plate 168, for example.
The same effects as in the above embodiment can be obtained even with a radiation therapy apparatus configured by rotating 68.

Embodiment 7 FIG. The radiation therapy apparatus according to the present embodiment includes:
As shown in FIG. 20, an apparatus main body 171 and a rotating body 172 rotatably disposed with respect to the apparatus main body 171 are provided. The rotating body 172 rotates around the treatment table 173 about the y-axis. Affected area (eye center) of patient's head
Irradiation is performed in a state in which the irradiation field of the radiation is restricted by the collimator 175. Also, the rotating body 1
Reference numeral 72 is formed in an arc shape with the affected part I as a center point. Further, radiation sources 176, which are irradiation units, are dispersedly arranged at four locations on the rotating body 172 so that the radiation is concentrated at the affected area I. In the figure, 177 is a shield for shielding radiation, 178 is a detector, and 179 is a fixture for fixing the patient's head.

Next, the operation will be described. When radiation is emitted from each of the radiation sources 176, each of the radiations is applied to the affected part I in a concentrated manner. By rotating the rotating body 172 by 360 ° in this state, the dose is concentrated on the affected part I three-dimensionally. And in this rotation,
Radiation is concentrated on the diseased part I in a state where one radiation source and three different conical shapes are formed by the four radiation sources 176, and the dose can be dispersed on the body surface of the patient.
Moreover, since the radiation sources 176 are provided at four locations, radiation can be irradiated in a short time. For example, an irradiation time of about 2 minutes can be sufficient to apply a dose of 60 Gy. In addition, the treatment can be performed without moving the patient during the irradiation. Further, the irradiation dose and the diameter of the collimator 175 can be appropriately adjusted or selected so that the distribution of the absorbed dose is close to the affected part I.

Further, the radiation transmitted through the patient can be shielded by the shield 177, and the building in which the apparatus is installed can be easily shielded. This shield 17
7 can be attached to a member other than the rotating body 172. In this case, the size of the shielding body 177 can be minimized by driving the shielding body 177 in synchronization with the rotation of the rotating body 172. .

Embodiment 8 FIG. The radiation therapy apparatus according to the present embodiment includes:
As shown in FIG. 21, a preamplifier 180 for amplifying a detection signal from a detector 178, and an image processing unit for image-processing a signal from the preamplifier 180 are provided with a rotator 172 configured in the same manner as in the seventh embodiment. 181 is provided. The processing signals of the imaging X-ray tube 180 and the image processing unit 181 are transmitted to the image display device 1.
At 82, the images are displayed as an X-ray fluoroscopic image 182A and a CT cross-sectional image 182B, respectively. In order to increase the resolution of an image, an imaging X-ray tube 183 of 150 KV or the like having lower energy than X-rays of 4 MV or the like may be separately provided. In this case, the detector 178 corresponding to the X-ray tube 183 is disposed so as to be symmetric with respect to the y-axis.

Next, the operation will be described.
The detection signal at 78 is amplified by the preamplifier 180, image-processed by the image processing unit 181, and displayed on the image display device 182. With this image, the position of the affected part I can be confirmed and the position can be adjusted. Further, if the detector 178 is configured as a two-dimensional detector, a fluoroscopic image can be obtained as shown in FIG. A cross-sectional image 182B can be obtained. In addition, in order to accurately and highly accurately position the diseased part I, the treatment table 173 is moved in a direction along the y-axis to take several CT cross-sectional images, and also take an X-ray fluoroscopic image. Thereby, the affected part I can be positioned three-dimensionally.

Embodiment 9 FIG. In the radiotherapy apparatus of the present invention,
As shown in FIG. 22, the apparatus main body 200 is provided with a motor 201 for moving the moving body 202.
The moving body 202 is moved along the rail 203 by the driving of. The moving body 202 has a bearing 2
An arm 205 which is a rotating body is provided through the arm 204.
It is designed to rotate. A radiation generating unit 206 as an irradiation unit and a collimator 20 are provided at the distal end of the arm 205.
7 are provided. In response to the movement of the moving body 202, the affected part 208 is located on the center axis A of the bearing 204, and the center axis A, the radiation generator 206, and the affected part 20.
8 is always orthogonal to the radiation center axis B.

By the way, in the case of the third embodiment shown in FIG. 11, three-dimensional irradiation to the affected part is possible, and the arm 152 is moved stepwise along the rail 157 so that the bearing 1
When rotated about the central axis 56, for example, FIG.
(A) and (b) are drawn as radiation irradiation trajectories having different radii of rotation.
When rotating around the central axis of the bearing 156 while continuously moving along the line 7, a spiral radiation trajectory is drawn. The rotational angular velocity of the arm 152 is constant, and (3) in FIG. 23 (a) having a small rotational radius increases the irradiation dose per unit length as compared with (1),
Radiation is thus applied to a part of the normal part. In this regard, in the case of this embodiment, when the arm 205 is rotated about the diseased part 208 while moving the moving body 202 and changing the irradiation angle of radiation on the diseased part 208,
The center axis A of the bearing 204 and the center axis B of radiation are always orthogonal to each other, and the radius of rotation does not change.
As shown in (b), the affected part 208 is irradiated with radiation.

Embodiment 10 FIG. FIG. 25 is an example different from the ninth embodiment in that the rail 210 is provided on the apparatus main body 211. FIG. 26 shows an alternative to the arm 205 of FIG.
9 shows a radiation therapy apparatus using the arm 152 of the third embodiment shown in FIG. FIG. 27 shows the arm 20 shown in FIG.
This is an apparatus using the arm 152 of FIG.

[0059]

As described above, according to the first aspect of the present invention, since the Y collimator can be moved over the entire range of the opening of the first collimator, the irradiation dose to the normal tissue can be improved. Can be provided to reduce the exposure dose to normal tissues.

According to the second aspect of the present invention, the irradiation unit reciprocates along an arcuate path in a direction intersecting the rotation direction while the treatment table is fixed. It is possible to provide a radiation therapy apparatus capable of dispersing the irradiation dose to normal tissues and suppressing the exposure dose to normal tissues.

According to the third aspect of the present invention, while the treatment table is fixed, the rotating body reciprocates in a direction intersecting the rotation direction of the irradiation unit at the connection with the apparatus main body. Therefore, a radiation therapy apparatus that can perform accurate treatment by precisely irradiating the radiation to the irradiating part and intensively irradiating the affected part by simply driving the irradiating part without complicatedly driving the treatment table. Can be provided.

According to the fourth aspect of the present invention, the apparatus main body is moved in an arc shape centering on the affected part with the treatment table fixed, so that the treatment table is complicated. It is possible to provide a radiation therapy apparatus capable of accurately aligning radiation with the irradiation unit and irradiating the affected part intensively to perform an accurate treatment by simply driving the irradiation unit without driving.

According to the fifth aspect of the present invention, since the radiation is concentrated on the affected part from a plurality of positions of the rotating body, the irradiation part is driven without complicatedly driving the treatment table. It is possible to provide a radiation therapy apparatus capable of accurately aligning radiation with an irradiation unit and irradiating the affected part intensively to perform highly accurate treatment.

According to the invention described in claim 6 of the present invention, when the moving body is moved to change the irradiation angle of radiation to the affected part and the arm is rotated about the affected part,
The central axis of the bearing and the central axis of the radiation are always orthogonal to each other, the radius of rotation does not change, and radiation is irradiated three-dimensionally to the affected area. Further, it is possible to provide a radiotherapy apparatus capable of minimizing the destruction of normal tissues.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the radiotherapy apparatus of the present invention.

FIG. 2 is a side view showing the operation of the collimator of the radiotherapy apparatus shown in FIG.

FIG. 3 is another side view showing the operation of the collimator of the radiation therapy apparatus shown in FIG.

FIG. 4 is an explanatory diagram showing a range of an affected part to be irradiated with radiation based on the operation of the radiotherapy apparatus shown in FIGS. 2 and 3;

FIG. 5 is a block diagram showing a drive system of the radiotherapy apparatus shown in FIG.

FIG. 6 is a view corresponding to FIG. 2 and showing still another embodiment of the radiotherapy apparatus of the present invention.

FIG. 7 is a view corresponding to FIG. 3, showing still another embodiment of the radiotherapy apparatus shown in FIG. 6;

FIG. 8 is an explanatory diagram showing a range of an affected area to be irradiated with radiation based on the operation of the radiotherapy apparatus shown in FIGS. 6 and 7.

FIG. 9 is a side view showing still another embodiment of the radiotherapy apparatus of the present invention.

FIG. 10 is a side view for explaining the operation of the radiotherapy apparatus shown in FIG. 9;

FIG. 11 is a side view showing still another embodiment of the radiotherapy apparatus of the present invention.

12A and 12B are diagrams showing a configuration of an arm of the radiotherapy apparatus shown in FIG. 11, wherein FIG. 12A is a side view thereof, and FIG. 12B is a side view showing a main part of another arm configuration. .

13A and 13B are views showing a state where the affected part is irradiated with the radiation therapy apparatus shown in FIG. 11, wherein FIG. 13A is a side view thereof and FIG. 13B is a front view thereof.

FIG. 14 is a side view showing still another embodiment of the radiotherapy apparatus of the present invention.

FIG. 15 is a view showing still another embodiment of the radiotherapy apparatus of the present invention, wherein FIG. 15 (a) is a side view thereof, and FIG. 15 (b) is a plan view thereof from below.

FIG. 16 is a plan view showing still another embodiment of the radiotherapy apparatus of the present invention.

FIG. 17 is a plan view showing a specific example of the radiotherapy apparatus shown in FIG. 16;

18 is a plan view showing a state where the affected part is irradiated with the radiation therapy apparatus shown in FIG. 17;

FIG. 19 is a plan view showing still another embodiment of the radiotherapy apparatus of the present invention.

FIG. 20 is a plan view showing still another embodiment of the radiotherapy apparatus of the present invention.

FIG. 21 is a plan view showing the overall configuration of the radiotherapy apparatus shown in FIG. 20;

FIG. 22 is a side view showing still another embodiment of the present invention.

23 (a) is a view of a trajectory irradiated with radiation based on the operation of the radiation therapy apparatus shown in FIG. 11, viewed from the center axis of the bearing, and FIG. 23 (b) is a side view of the radiation therapy apparatus. FIG.

24 (a) is a view showing a state where radiation is applied based on rotation of the arm of the radiation therapy apparatus shown in FIG. 22, as viewed from the center axis of the bearing, and FIG. FIG. 7 is a diagram showing a state where radiation is applied based on the central axis of the bearing.

FIG. 25 is a side view showing still another embodiment of the present invention.

FIG. 26 is a side view showing another embodiment of the present invention.

FIG. 27 is a side view showing still another embodiment of the present invention.

FIG. 28 is a side view showing another example of a conventional radiotherapy apparatus.

FIG. 29 is a plan view showing a collimator of the radiotherapy apparatus shown in FIG. 28 taken out therefrom;

30 is an explanatory diagram showing a range of an affected part to which radiation is applied based on the operation of the radiation therapy apparatus shown in FIG. 28.

FIG. 31 is a side view showing another example of the conventional radiation therapy apparatus.

FIG. 32 is a view showing another example of the conventional radiotherapy apparatus, wherein FIG. 32 (a) is a side view and FIG. 32 (b) is a front view.

33 is a view showing a state where the affected part is irradiated by the radiotherapy apparatus shown in FIG. 32, wherein FIG. 33 (a) is a plan view thereof and FIG. 33 (b) is a side view thereof.

34 is a view showing a state where the affected part is irradiated by the radiation therapy apparatus shown in FIG. 32, wherein FIG. 34 (a) is a side view thereof, and FIG. 34 (b) is a lateral sectional view thereof.

FIG. 35 is a plan view showing a state in which the treatment table of the radiation therapy apparatus shown in FIG. 32 is driven.

36 is a plan view showing a state in which a treatment table of the radiotherapy apparatus shown in FIG. 32 is driven to treat an affected part with radiation.

37 is a plan view showing a state in which the treatment table of the radiation therapy apparatus shown in FIG. 32 is driven to irradiate an affected part of a patient with radiation while avoiding an important organ.

FIG. 38 is a side view showing still another example of the conventional radiotherapy apparatus.

FIG. 39 is a side view showing still another example of the conventional radiotherapy apparatus.

[Explanation of symbols]

133 treatment table, 134 X-ray generator (irradiation unit), 1
35 First collimator, 136 Y collimator, 138
X collimator, 144 irradiation head unit (irradiation unit), 1
45 drive unit (rotating body), 145A arc-shaped path, 1
52 arms (arc-shaped rotating body), 157 rails (arc-shaped path), 167 rails (arc-shaped path), I
Isocenter or affected area, 200 main body, 202
Moving body, 204 Bearing, 205 Arm (rotary body), 206 Radiation generator, 208 Affected part, 211
The device body.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuyuki Hanakawa 8-1-1, Tsukaguchi Honcho, Amagasaki City, Hyogo Prefecture, Japan Communication Equipment Works (72) Inventor Seiji Funata Tsukaguchi, Amagasaki City, Hyogo Prefecture 8-1-1, Honcho, Communication Machine Works, Mitsubishi Electric Corporation

Claims (6)

[Claims] An irradiation unit for irradiating radiation, a plurality of collimators for restricting a radiation irradiation field (horizontal x direction and y direction) from the irradiation unit, and a treatment performed by the radiation whose irradiation field is limited by each collimator. A radiation treatment apparatus including a treatment table for a patient to receive the radiation field of the collimator, which restricts the y direction of the radiation field, of the plurality of collimators, within the opening range of the collie meter that restricts the x direction. A radiotherapy apparatus characterized in that it can be moved in any direction and the treatment table can be moved in conjunction with the former collimator. 2. A rotating body rotatably connected to a main body of the apparatus, and an irradiating unit housed in the rotating body, and irradiating radiation from the irradiating unit while rotating the rotating body to treat an affected part. In the radiation therapy apparatus, the arcuate path is formed in the rotating body in a direction intersecting with the rotation direction of the irradiation unit, and the irradiation unit is configured to be able to reciprocate along the path. Radiation therapy equipment. A rotating body rotatably connected to the apparatus main body; and an irradiating section housed in the rotating body, and irradiating radiation from the irradiating section while rotating the rotating body to treat an affected part. In the radiotherapy apparatus, the rotating body has an arc shape and has the irradiating portion at an end thereof, and the rotating body reciprocates in a direction intersecting the rotation direction of the irradiating portion at a connecting portion with the device main body. A radiotherapy device characterized by being movably configured. 4. A rotating body rotatably connected to an apparatus main body, and an irradiation unit housed in the rotating body, and irradiating radiation from the irradiation unit while rotating the rotating body to treat an affected part. A radiotherapy apparatus according to claim 1, wherein said apparatus main body is configured to be movable in an arc shape centering on an affected part. 5. A rotating body rotatably connected to an apparatus main body, and an irradiation unit housed in the rotating body, and irradiating radiation from the irradiation unit while rotating the rotating body to treat an affected part. In the radiation therapy apparatus, the rotating body is formed in an arc shape with the diseased part as a center point, and the irradiation units are dispersedly arranged so that radiation is concentrated on the rotating body at the diseased part. Radiation therapy equipment. 6. An apparatus main body, a moving body movable in an arc shape with respect to the apparatus main body, a rotating body provided on the moving body via a bearing and rotatable about the bearing, and a rotating body provided in the rotating body. The irradiation part is housed, and the affected part is on the center axis of the bearing, and the center axis and the line connecting the irradiation part and the affected part are always orthogonal to the movement of the moving body. A radiation treatment apparatus for treating the affected part by irradiating the affected part with radiation from the irradiation part while rotating the rotating body about the affected part.